We could prevent the next housing crash just by limiting mortgages to amounts that could be paid back by renting out the house.

But than how would the statist "capitalist" "investors" justify helping the poor (pay THEIR rent) and all the help he process is owed via subsidizing housing

Landlord infestors: its time to raise rents. I need to maximize my profits,,,,in same breath,,,,but the evil, stupid right wingers are exploiting the poor! We compassionate landlords need to help the poor afford housing. More section 8 cowbell, please!

We could prevent the next housing crash just by limiting mortgages to amounts that could be paid back by renting out the house.

By whose metric & whose calculator? :)

You don't need a calculator to see that if the rent can pay the cost of owning, then anyone who can't pay the mortgage from his salary can rent out the house to pay the mortgage that way instead. So there would not be any foreclosures. The worst that would happen is that an owner might be forced to rent out his house and live elsewhere for a while.